Mount Prospect, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

016
FXUS63 KLOT 021100
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
500 AM CST Fri Jan 2 2026

.KEY MESSAGES...

- Chance (20-30%) for a wintry mix across far northern IL Sunday
  evening.

- Above average temperatures expected much of next week.

&&

.DISCUSSION...
Issued at 302 AM CST Fri Jan 2 2026

Through Tonight:

Quiet conditions will persist here in the short term. Early
this morning, the area sits beneath a low level stratus deck
that`s slowly been filling in from the north since yesterday
afternoon. Guidance is doing an awful job at resolving these low
ceilings and, as a result, temperature guidance is also
struggling this morning. We`ve managed to stay a few to several
degrees warmer than just about all guidance during the night
with a number of sites even having warmed a degree or two since
last evening. Some clearing over south-central WI is spreading
south as drier BL air fills in. This should chip away at the
stratus locally during the morning hours with most of today
expected to offer up a mix of clouds and sunshine.

Given the milder conditions to start the day, bumped daytime
temperatures today a degree or two higher than some of the
warmer camps to get middle 20s around a majority of our area to
around 30 degrees in our far south. While winds will be
generally light, conditions may feel more like the teens and
lower 20s for the better part of the day. Broad high pressure
beneath a regional NW upper flow pattern will keep precip
chances at bay today. Lows tonight are forecast to drop into the
teens to around 20 degrees.

Doom


Saturday through Thursday:

Conditions will remain seasonably chilly through the weekend,
with high temperatures around 30 and overnight lows in the
teens. While most areas will remain precipitation free through
the weekend, we will be monitoring a low amplitude clipper type
impulse that will be tracking eastward across the Upper Great
Lakes on Saturday. Most, if not all of the precipitation
potential with this impulse will remain north and northeast of
our area. However, we certainly cannot rule out the possibility
of a few snow flurries sneaking as far south as parts of far
northeastern IL Saturday morning. This appears to be the worst
case scenario at this time, as a rather parched low-level
airmass should largely curtail the precipitation threat with
southward extent.

Upper ridging across the western CONUS into Saturday will build
eastward through the weekend, ultimately fostering a shift
towards a milder quasi-zonal (west-to- east oriented) mid and
upper-level flow pattern across our region by early next week.
This warmer pattern will be kick started Sunday night as warm
air advection quickly ramps up across much of the Midwest into
the Great Lakes region in advance of the next impulse tracking
into the Upper Midwest. Accordingly, this is expected to result
in nearly steady (or even slowing rising) surface temperatures
in the upper 20s to the low 30s Sunday night, followed by
temperatures warming into the 40s for daytime highs Monday.

While we will be trending in a good direction with temperatures
into Monday, there is some concern for a period of light
freezing precipitation across parts of northern IL Sunday night.
This as, our area looks to reside along the southern periphery
of a developing warm air advection induced precipitation shield
Sunday night. Overall, this does not look to be a big icing
event for any of our area, but the potential does exist for a
period of freezing precipitation across portions of far northern
IL (north of I-88) Sunday night before temperatures warm above
freezing Monday morning. We will continue to monitor this
potential.

Temperatures Monday through the remainder of the work week are
expected to be above average, with highs generally in the 40s
(possibly near 50 at times) and overnight lows in the 30s.
Generally dry weather is anticipated, though we will see some
increased chances for rain with another potential storm system
for the second half of the week.

KJB

&&

.AVIATION /12Z TAFS THROUGH 18Z SATURDAY/...
Issued at 500 AM CST Fri Jan 2 2026

There are no significant aviation weather concerns anticipated
through the period.

A persistent high MVFR stratus deck continues to hang on across
the terminal airspace early this morning. However, recent
satellite trends suggest that this deck of stratus will begin
to scatter from north-to-south across the Chicago area terminals
after 12Z this morning. Accordingly, we should experience a
quick return to VFR conditions across the airspace through the
early and mid morning hours today.

Winds will remain light (5 to 10 kt) from the northwest through
the day, then trend more north-northwest tonight into Saturday
morning.

KJB

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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